I also have:

XTerm.vt100.translations:    #override \n\

               Shift <KeyPress> KP_Multiply:secure() \n\

               ~Shift~Ctrl<Btn2Up>: insert-selection(PRIMARY, CUT_BUFFER0) \n\

               Shift~Ctrl<Btn2Up>:  insert-selection(CLIPBOARD, CUT_BUFFER1) \n\

               <BtnUp>:       select-end(PRIMARY, CLIPBOARD, CUT_BUFFER0, CUT_BUFFER1) \n\

               Ctrl Shift <KeyPress> Y: insert-selection(CLIPBOARD, CUT_BUFFER1)

The first one sets up secure mode - good for typing in passwords without the risk of a chat window popping up, stealing focus, and getting my password. If only I would remember to use it...

The rest supports CLIPBOARD (cut/copy/paste) as well as CUT_BUFFER0 (middle button) for cut and paste. Was getting annoyed with the increasing number of websites that don't seem to work properly with middle mouse button paste (e.g. request tracker).

I only wish I could do these with rxvt. xterm seems to have problems at times displaying certain Unicode characters compared with any other program. (Note last I extensively tested this was with Ubuntu 12.04).

Brian May